Ch4_llewellynm

11/15/2011 Homework Newton's Laws Lesson 1 a, b, c, d

1. Does Newton's First law roughly sum-up to be, "unless there is a non 0 net force, a =0"?
   1. Yup.
2. Does this have anything to do with (very very basic) relativity?
   1. Yup, because at rest and at a constant velocity are nearly the same thing. Think of a ball on a train and a ball in a park, works the same right? Funky.

1. How is inertia related to mass?
   1. The more mass an object has the more inertia it has, it resists changes in it's state of motion harder. Mass is the only factor that effects inertia.
2. What do ramps have to do with explaining inertia (no friction)?
   1. If there is a symmetrical U and a ball is rolled down one side it will roll up an equal amount of height on the other side. If the U is not symmetrical then it will also reach the same height. So if the U is really a curvy L then the ball will roll forever "trying to get to the same height".
3. Is inertia a force?
   1. No! inertia is entropy, it does not change the system it's energy inside the system. Forces are energy being expended outside a system.

1. Can that entire page be summed up in one sentence?
   1. Yes. Inertia is an objects tendency to resist change in velocity, also known as acceleration.

1. What are some examples of balanced and unbalanced forces?
   1. Two identical trucks in a tug of war not moving are an example of balanced forces.
   2. A truck and a Prius in a tug of war where the truck is moving forward is an example of unbalanced forces.
2. What does equilibrium mean?
   1. That all the forces on a system are balanced.
3. What happens when forces are unbalanced?
   1. There is a nonzero net force, so there is then acceleration in one direction.